KR100812712B1 - High temperature generator for absorptive type refrigerator - Google Patents

Abstract

A high temperature generator for an absorption type refrigerator is provided to employ a dual pipe type heater having a space between inner and outer pipes to be communicated with a transfer duct for carrying out secondary heat exchange with high temperature exhaust gas exhausting along the transfer duct, thereby maximizing heating efficiency with waste heat of the exhaust gas. A high temperature generator for an absorption type refrigerator includes a transfer duct mounted at an opposite side of a burner for transferring high temperature exhaust gas, carrying out heat exchange with heating pipes(34) and fins(38) thereof actively, to an upper liquid chamber, and a dual pipe type heater(50) formed of inner and outer pipes(55,57) with an internal space therebetween to be communicated with the transfer duct to carry out heat exchange with the transferred exhaust gas.

Description

High temperature generator for absorptive type refrigerator

1 is a block circuit diagram for explaining the operation of a general absorption chiller,

Figure 2 is a front side cross-sectional view showing the inside of the high temperature regenerator employed in FIG.

3 is a block circuit diagram for explaining the operation of the absorption chiller according to the present invention;

Figure 4 is a front side cross-sectional view showing the inside of the high temperature regenerator adopted in FIG.

5 is a plan view showing the internal structure of the high temperature regenerator according to the present invention as viewed from above;

Figure 6 is a side structural view showing the internal structure of the high temperature regenerator according to the present invention from the left direction, and

7 is a perspective view of a high temperature regenerator according to the present invention.

<Description of the symbols for the main parts of the drawings>

  10: space part 12: high temperature regenerator

  14: external 16: old

  18: refrigerant outlet 20: solution inlet piping

  22: solution outlet piping 26: combustion air inlet

  30 exhaust gas outlet 34 heat transfer pipe

  38: heat pipe fin 50: double tube heater

  51: entrance header 53: exit header

  55: inner tube 57: appearance

The present invention relates to a high temperature regenerator for absorption chillers, and more particularly, the space between the outer tube and the inner tube of the double tube heater located in the upper liquid chamber after the exhaust gas generated by the gas burner undergoes heat exchange with the solution in the heating chamber. The present invention relates to a high temperature regenerator for an absorption chiller, which can be supplied in a manner to maximize the heat transfer efficiency.

In general, the structure and the refrigeration cycle of the absorption chiller, first, evaporator (2), absorber (3), low temperature regenerator (6), condenser (5), high temperature regenerator (12), high temperature solution heat exchanger (9), low temperature solution It consists of a heat exchanger, a solution pump, and a refrigerant pump. Cold water used for such absorption cooling passes through a heat pipe of the evaporator 2 and is cooled while being deprived of heat by the latent heat of evaporation of the refrigerant.

The vaporized refrigerant vapor flows into the absorber and is absorbed into the lithium bromide (LiBr) aqueous solution, and the absorption heat generated by absorbing the refrigerant vapor is removed by the cooling water flowing in the absorber heat pipe. It will always maintain a constant temperature.

In addition, the aqueous solution of lithium bromide cooled and diluted in the absorber is heated by a solution of lithium bromide which forms a high temperature and high concentration while passing through the low temperature solution heat exchanger by a solution pump, and then the high temperature regenerator (12) via the high temperature solution heat exchanger (9). It will flow into.

The dilute aqueous solution supplied to the hot regenerator 12 is heated by the combustion gas to generate a high temperature refrigerant vapor, thereby concentrating the aqueous solution into a high temperature thick solution.

On the other hand, the refrigerant used for heating the low temperature regenerator 6 and the refrigerant generated in the low temperature regenerator 6 are cooled by the cooling water in the condenser 5 to condense, and the refrigerant condensed as described above is evaporated by gravity and pressure difference. 2) is to enter the cold water required for cooling.

That is, the high temperature regenerator 12 serves to generate a refrigerant vapor by heating a dilute solution contained in the high temperature regenerator 12 by combustion gas or exhaust gas, and the refrigerant vapor generated therein is a low temperature regenerator ( 6) is used as a heat source for heating.

1 is a view showing the configuration of a general absorption chiller. As illustrated, the absorption chiller is an absorber (3), a high temperature regenerator (12) and a burner (71) provided therein, a low temperature regenerator (6), a condenser (5), an evaporator (2), a low temperature solution heat exchanger (8). It consists of an absorption liquid circulation pump 32 and piping.

Briefly describing the operation of the absorption chiller of the above-described configuration, the absorbent liquid falls from the tray above the absorber 3 onto the known cooling water heat pipe in the absorber 3, absorbing the refrigerant that has passed between the eliminators and absorber 3 Gather on the floor.

At this time, the concentration of the absorbent liquid is much thinner than before it flows to the tray, and the concentration is about 58%. The absorbed liquid of the collected rare solution (dilute concentration) is absorbed by the low temperature solution heat exchanger (8) and the high temperature solution by the absorption liquid circulation pump in the absorber (3). The heat is exchanged to a high temperature of about 120 to 140 degrees through the heat exchanger (9) to rise to the high temperature regenerator (12), and when heated further by the heat source in the high temperature regenerator (12) At), the refrigerant evaporates and the concentration increases.

On the other hand, the intermediate liquid (medium liquid absorbing liquid) whose concentration is increased by about 60% is passed through the high temperature solution heat exchanger 9, and the temperature is lowered to about 90 ° C., thereby rising to the low temperature regenerator 6.

The absorber is transported from the absorber 3 to the high temperature regenerator 12 by the earth output of the absorption liquid circulation pump 32, but from the high temperature regenerator 12 to the low temperature regenerator 6 between the high temperature regenerator 12 and the low temperature regenerator 6 It is carried by pressure difference.

That is, since the pressure of the high temperature regenerator 12 is about 900 to 920 mmHg and the temperature of the low temperature regenerator 6 is about 60 mmHg, the absorbent liquid whose concentration is increased in the high temperature regenerator 12 by this pressure difference is the low temperature regenerator. Is transported to (6).

In the low temperature regenerator 6, the hot refrigerant vapor separated from the high temperature regenerator 12 and turned into steam passes through the heat transfer tube in the low temperature regenerator 6 to heat the intermediate liquid once more, thereby increasing the concentration of the intermediate liquid. It is made up of 62% absorbent liquid.

At this time, the concentration of the absorbent liquid is the strongest, and in the low temperature regenerator 6, the concentrated solution (the concentrated absorbent liquid) is passed through the low temperature solution heat exchanger 8 at a temperature of about 48 to 50 ° C. lower than the absorber ( 3), the absorption liquid flows to the absorber 3 due to the height difference between the low temperature regenerator 6 and the absorber 3 and the pressure difference between the low temperature regenerator 6 and the absorber 3.

Through this process, the absorbent liquid absorbs the refrigerant again and continues to circulate in the same manner.

In addition, the refrigerant evaporates in the evaporator (2) to make the water in the cold water heat exchanger tube cold cold water, the refrigerant in the form of steam is absorbed by the absorbent liquid and mixed with the absorbent liquid to the high temperature regenerator (12), the high temperature regenerator (12) When heated by a heat source at, the refrigerant vapor separated and evaporated from the absorbent liquid in the upper part of the high temperature regenerator 7 goes to the low temperature regenerator 6 along the refrigerant vapor pipe.

Then, the refrigerant vapor moved to the low temperature regenerator 6 flows to the heat transfer tube in the low temperature regenerator 6 to heat the intermediate liquid once more.

The refrigerant vapor passing through the low temperature regenerator (6) heats the absorbing liquid in the low temperature regenerator (6) and condenses into water that is a refrigerant, and the condensed refrigerant moves to the condenser (5) and is recovered to the evaporator (2). Refrigerant vapor remaining without condensation in 6) is condensed by the cooling water of the condenser (5).

The refrigerant in the condenser 5 is recovered to the evaporator 2 and circulated in the same order as above.

The high temperature regenerator 12 has a structure similar to a known structure, and includes an outer cylinder 14 of the high temperature regenerator 12 having a space 10 formed therein, and a furnace 16 accommodated and installed therein. have.

On the other hand, one side portion of the furnace 16 is installed in a state in which a plurality of heat transfer pipes 34 provided with a through hole 36 in the attached, vertically, through the heat transfer tube, some of the heat transfer pipes 34 On (34), a plurality of heat pipe fins 38 having through holes 36 formed in the center thereof are fitted in a state of maintaining a constant interval.

However, the conventional heat transfer pipe 34 as described above is simply formed in a structure in which the exhaust gas by the gas burner 71 is simply discharged to the outside through the exhaust gas outlet 30 via the furnace 16, exhaust gas As the exhaust gas flows out while forming a constant streamlined flow along the surface at the moment when it hits the outer circumferential surface of the heat transfer tube 34, only an heat exchange effect with the heat transfer tube 34 is performed, thereby attempting to increase thermal efficiency.

Accordingly, the present invention has been made to solve the above problems, the internal space communicating with the transfer duct for heat exchange via the high-temperature exhaust gas from the transfer duct disposed on the opposite side of the gas burner between By adopting a double tube heater consisting of an inner tube and an outer shape to form a secondary heat exchange, the exhaust gas discharged is discharged as before, and the rare liquid flowing into the high temperature regenerator flows into the inner heat transfer tube of the double tube and is relatively discharged. The low temperature solution and the high temperature exhaust gas can conduct heat transfer through the heat exchanger tube to maximize the heat transfer efficiency, and use the exhaust gas that is discarded as waste heat in the system. The main technical purpose is to improve the quality of the system.

The present invention for achieving the above object,

The furnace is provided with both exhaust gas inlets / outlets exposed to a predetermined length inside the outer cylinder. A plurality of heat transfer tubes are provided to penetrate vertically to one side of the furnace to heat the aqueous solution. In the high temperature regenerator for an absorption refrigerator having heat pipe pins which are inserted into the outside of the heat pipes in order to exchange heat with the exhaust gas passing through,

A transfer duct installed on an opposite side of the burner so as to transfer the high temperature exhaust gas in which the heat exchange action with the exhaust gas is actively performed in the heat transfer tube and the heat transfer tube pin to the upper liquid chamber;

It characterized in that it comprises a double tube heater consisting of an inner tube and an outer shape to form an internal space in communication with the transfer duct for heat exchange via the high temperature exhaust gas from the transfer duct.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are cross-sectional structural views showing in detail the internal structure of the high-temperature regenerator for absorption refrigerator according to the present invention, the same reference numerals as in the attached exemplary drawings 1 and 2 denote the same parts, Descriptions will be omitted and only differences from FIGS. 1 and 2 will be described.

On the other hand, the accompanying drawings Figure 5 is a plan view showing the internal structure of the high temperature regenerator according to the present invention from above, Figure 6 is an illustration of the internal structure of the high temperature regenerator according to the present invention seen from the left direction One is a side structural view, Figure 7 is a perspective view of a high temperature regenerator according to the present invention.

As shown in FIG. 5, the high temperature regenerator 12 includes, first, an outer cylinder 14 of the high temperature regenerator 12 having a space 10 formed therein, and a furnace that is accommodated and installed therein. It consists of a (16), first the upper side of the outer cylinder 14, the refrigerant discharge port 18 for discharging the refrigerant vapor is formed, one side of the outer cylinder 14, the solution inlet pipe spaced apart from each other by a predetermined distance (20) and the solution outlet pipe (22) are connected to each other in a state of communicating with the inside while forming a step, the lithium bromide aqueous solution (24) in the space portion 10 of the outer cylinder (14) solution outlet pipe (22) It is filled with a little lock.

In addition, the furnace cylinder 16 installed inside the outer cylinder 14 is horizontally installed so that both sides thereof are drawn out by a predetermined length through the outer cylinder 14 corresponding thereto in the state completely immersed in the aqueous solution 24. The combustion air inlet 26 provided on one side of the 16 is provided with a flange 28 for facilitating connection and coupling with the burner 71, and the other side corresponding to the combustion air inlet 26 communicates with each other. The exhaust gas outlet 30 is formed in the state.

On the other hand, one side portion of the furnace 16 is installed in a state in which a plurality of heat transfer pipes 34 having a through hole 36 provided therein, as shown in FIG. On some of the heat transfer tubes 34 of the three heat transfer pipes 34, a plurality of heat transfer pipe fins 38 having a through hole 36 in the center are inserted in a state of maintaining a predetermined interval.

The high temperature regenerator 12 configured as described above is shown in FIGS. 3 to 5, the lithium bromide aqueous solution 24, which is cooled and diluted from the absorber 3, not shown first, is the high temperature regenerator 12. It is supplied through the solution inlet pipe 20 connected to the outer cylinder 14 of the, the aqueous solution 24 supplied in this way is the heat transfer tube 34 and the through hole (36) of the furnace cylinder 16 is installed inside the outer cylinder (14) In addition, the solution outlet pipe 22 is filled to be slightly submerged from the water surface.

In addition, the dilute aqueous solution 24 introduced into the high temperature regenerator 12 moves the high temperature exhaust gas through the exhaust gas inlet 26 of the furnace 16 to the exhaust gas outlet 30, wherein the furnace 16. There are a plurality of heat pipe 34 is vertical, through the heat transfer tube 34, the heat transfer tube fin 38 as shown in Figure 2 attached to the state accommodated in the furnace 16 is fitted, Heat exchange and heat transfer are performed between the high-temperature exhaust gas and the heat transfer tube 34 and the heat transfer tube fin 38 to form the aqueous solution 24 accommodated in the through hole 36 of the heat transfer tube 34 at a high temperature.

Then, when the aqueous solution 24 filled in the through hole 36 of the heat transfer tube 34 is heated to a high temperature, while generating a high-temperature refrigerant vapor, the aqueous solution 24 is formed as a high-temperature concentrate, in this way The formed hot concentrated solution 24 is supplied to the high temperature solution heat exchanger 9 through the solution outlet pipe 22 again, and the refrigerant vapor is discharged to the refrigerant outlet 18 to heat the low temperature regenerator 6. It is used as a heat source for.

In addition, a plurality of heat pipe fins 38 are fitted on the heat pipe 34 vertically penetrating the furnace tube 16, and the through holes 36 are fitted in the heat pipe 34 to the inside of the heat pipe fins 38. Is formed.

On the opposite side of the burner 71, the transfer duct 40 transfers the high-temperature exhaust gas in which the heat exchange action with the exhaust gas is actively performed in the heat transfer tube 34 and the heat transfer tube fin 38 to the upper liquid chamber. It is provided so that communication with the burner 71 is possible.

In addition, in the space portion of the upper part of the gas burner 71, an internal space communicating with the transfer duct 40 for heat exchange through the high-temperature exhaust gas from the transfer duct 40 is formed therebetween. The double tube heater 50 which consists of the inner tube 55 and the exterior 57 is cross-arranged.

In addition, both sides of the inner tube 55 of the double tube heater 50 are fed to the inner tube 55 by the earth output of the absorption liquid circulation pump 32 and discharged, respectively, so that the inlet header 51 and the outlet header 53 are discharged. It is coupled to a number of points so as to communicate with it.

In addition, between the inner tube 55 and the outer tube 57 of the double tube heater 50, the outer tube 57 and the inner tube 55 are arranged to be spaced apart from each other, thereby supporting the gas burner 71. The cross-shaped or straight spacers 60 are arranged so that the high-temperature exhaust gas of () can penetrate.

In addition, the leg portions 61, 62, 63, 64 of the cross-shaped spacer 60 are connected by four connecting portions 60a, and the upper and lower leg portions 61, 63 of the leg portions facing each other are connected to each other. It is preferable that the height is different, and in particular, the lower leg portion 63 is configured to be long. The condensed milk is intended to maximize the efficiency of heat exchange by making the most of the updraft while the high temperature exhaust gas of the gas burner 71 passes between the inner tube 55 and the exterior 57.

In addition, the hot exhaust gas of the gas burner 71 transferred through the space between the exterior 57 and the inner tube 55 is finally heat-exchanged with the inlet header 51, and then surrounds the inlet header 51. While being discharged through the exhaust port 73 of the exhaust duct 70 installed on the upper side of the high temperature regenerator 12 is coupled to communicate with the space between the inner and outer tubes of the double tube heater.

The present invention configured as described above is first shown in FIGS. 3 and 4 attached while the high temperature exhaust gas introduced through the combustion air inlet 26 of the furnace 16 exits the exhaust gas outlet 30. Heat exchanger tube 38 is fitted to the heat transfer tube 34 as shown in the drawing. First, when the exhaust hits the outer circumferential surface of the heat transfer tube 34, the heat transfer tube 34 and the heat transfer tube fins flow in a constant flow along a circular plane. The heat exchange action with the exhaust gas is actively performed in the entire area of the 38, and then the vehicle is circulated through the transfer duct 40 on the side surface and flows between the outer tube 57 and the inner tube 55 of the double tube heater 50 to circulate the absorbent liquid. After being fed to the inlet header 51 and the outlet header 53 based on the output of the pump 32 and being re-introduced, the gas 32 is delivered into the high temperature regenerator through the solution inlet pipe of the high temperature regenerator. Heat source as secondary heat source , It will be utilized.

At this time, the absorbent liquid transfer from the inlet header 51 to the outlet header 53 is carried out through the inner tube 55 of the double tube heater 50, in the opposite direction to the absorbent liquid transfer direction on the outside of the inner tube (55). By heat exchange with the high-temperature exhaust gas of the moving gas burner 71, it is possible to maximize the heat transfer efficiency.

As described above, the present invention employs a double tube heater made of an inner tube and an outer tube forming an inner space therebetween communicating with the transfer duct for heat exchange via a high temperature exhaust gas from the transfer duct disposed on the opposite side of the gas burner. Thus, after performing the secondary heat exchange of the outflowing exhaust gas, the exhaust gas is discharged as in the conventional manner, and the rare solution flowing into the high temperature regenerator flows into the inner heat transfer tube of the double pipe, so that the solution of relatively low temperature and the exhaust gas of high temperature are discharged. By configuring the heat transfer through the heat transfer tube, the heat transfer effect can be further improved, and accordingly, the installation quantity of the heat transfer tube can be reduced, thereby miniaturizing the high temperature regenerator and reducing the production cost.

Claims (5)

The furnace is provided with both exhaust gas inlets / outlets exposed to a predetermined length inside the outer cylinder. A plurality of heat transfer tubes are installed to penetrate vertically to one side of the furnace and heat the aqueous solution. In the high temperature regenerator for an absorption chiller having a gas burner installed to form a flame, the absorption liquid passed through a low temperature solution heat exchanger and a high temperature solution heat exchanger by an absorption liquid circulation pump, A transfer duct provided on an opposite side of the gas burner so as to transfer the high temperature exhaust gas, in which heat exchange with the exhaust gas is actively performed in the heat transfer tube and the heat transfer tube pin, to the upper liquid chamber; It includes a double tube heater consisting of an inner tube and an outer shape to form an internal space in communication with the transfer duct for heat exchange via the high temperature exhaust gas from the transfer duct, Both sides of the inner tube of the double tube heater are discharged to the downstream pipe of the high temperature solution heat exchanger via the inlet header through which the absorbent liquid passed through the low temperature solution heat exchanger is fed by the earth output of the absorbent circulation pump and through the inner tube. Hot regenerator for absorption chillers, characterized in that coupled to the outlet header connected to each other. delete The method of claim 1, Absorption-freezing, characterized in that a cross-shaped spacer is disposed between the inner tube and the outer tube of the double tube heater so that the outer tube and the inner tube are spaced apart from each other, so that the hot exhaust gas of the gas burner can pass therethrough. High temperature regenerator. The method of claim 3, wherein High-temperature regenerator for absorption chillers, characterized in that the height of the upper and lower leg portions of the cross-shaped spacers facing each other are different, the lower leg portion is long. The method of claim 1, The high temperature exhaust gas of the gas burner transferred through the space between the exterior and the inner tube is heat-exchanged with the inlet header, and then is discharged through the exhaust port of the exhaust duct installed on the upper side of the hot regenerator while surrounding the inlet header. High temperature regenerator for absorption chiller characterized in that.

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